TSQL日期时间比较

Question

我想要做的是从sql获取结果,其中日期在一定范围内,但它不能正常工作,这是我的查询.

DECLARE @CurrDate DATETIME
SET @CurrDate = GETDATE()
SELECT dbo.ProductDetails.PartnerID
      ,dbo.ProductDetails.ProductID
      ,dbo.Products.ProductName
      ,StartDate
      ,EndDate
FROM dbo.ProductDetails
    INNER JOIN dbo.Products
        ON dbo.ProductDetails.ProductID = dbo.Products.ProductID
WHERE CONVERT(VARCHAR(10),StartDate,111) <= @CurrDate
  AND CONVERT(VARCHAR(10),EndDate,  111) >= @CurrDate 

但是当该Enddate = @CurrDate行没有显示时,如果我将该日期提高一天,则会显示该日期.我做错了吗？任何建议都可以,谢谢.

Answer 1

GetDate()返回日期和时间,而你转换为varchar去除了时间部分(我怀疑这是它实际应该做的全部).所以你需要做同样的转换@CurrDate.

如果你想要的只是简单地考虑日期(忽略时间部分),你可以使用DATEDIFF而不是转换为varchar(见这里); 例:

DECLARE @CurrDate DATETIME
SET @CurrDate = GETDATE()
SELECT dbo.ProductDetails.PartnerID, dbo.ProductDetails.ProductID, 
         dbo.Products.ProductName , StartDate, EndDate
    FROM dbo.ProductDetails INNER JOIN
         dbo.Products ON dbo.ProductDetails.ProductID = dbo.Products.ProductID
    -- where StartDate is on the same day or before CurrDate:
    WHERE DATEDIFF(day, StartDate, @CurrDate) >= 0 AND
    -- and where EndDate is on the same day or after CurrDate:
          DATEDIFF(day, EndDate, @CurrDate)   <= 0